Physics
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.7170c&link_type=abstract
Journal of Geophysical Research, vol. 84, Dec. 1, 1979, p. 7170-7176.
Physics
3
Coherent Radiation, Earth Magnetosphere, Pulsed Radiation, Very Low Frequencies, Wave Generation, Geomagnetism, Pulse Generators
Scientific paper
In an experiment with man-made VLF whistler mode waves, VLF pulses of 1 s duration are interrupted by a 10 ms gap. The data indicate that the growth rate and saturation level of the postgap section of a pulse are independent of the phase shift introduced in the gap. Moreover, rising frequency emissions closely resembling those emissions that appear near the ends of constant-frequency signals are triggered during the 10 ms gap. An explanation of gap-induced emissions is suggested, based on the hypothesis that the radiation from the wave-organized electrons can switch from a forced to a natural mode after termination of the triggering wave. An experiment on the relation between gap length and the development of falling emissions (FEs) confirms that FEs always start with a small rise in frequency, and shows that a postgap signal can 'capture' a gap-induced FE when its frequency is close to that of the postgap signal at its beginning.
Chang Der-Chen
Helliwell Robert A.
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